Non-isothermal dissolution of a solid particle in liquid
Journal
Journal of the Chemical Society, Faraday Transactions
Journal Volume
89
Journal Issue
11
Pages
1689-1693
Date Issued
1993
Author(s)
Liu B.
Abstract
The behaviour of the non-isothermal dissolution of a solid particle in liquid is modelled theoretically. It is assumed that the diffusion of solute molecules to the bulk liquid phase is the rate-determining step. For the dissolution of hexamethylenetetramine in water (£GH = -34.14 cal g-1), depending upon the width of the diffusion layer, the maximal temperature increase at the solid/liquid interface is ca. 0.2-1.1 ¢XC, and for the dissolution of urea in water (£GH = 60 cal g-1) the maximal temperature decrease at the solid/liquid interface is ca. 0.5-2.0 ¢XC. The difference between the temperature at the solid/liquid interface and that of the bulk liquid phase is ca. ¡Ó 0.5 ¢XC for most of the period of dissolution. For the dissolution of non-dissociating substances in water, if the temperature of the liquid phase remains constant, the heat released during the course of dissolution has a negligible effect on the dissolution behaviour. In some cases, however, solving the governing equation for the resolution of the exact temperature profile is necessary.
SDGs
Type
journal article